Bubble Level vs PDF Viewer
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Bubble Level
This tool helps you ensure surfaces are perfectly horizontal or vertical using various measurement modes. It offers features like angle locking, calibration for accuracy, and an audible indicator for precise leveling.
- Multiple leveling modes (Circle, Vertical, Horizontal, Mix)
- Lock current angle feature
- Calibration for accurate readings
- Audible indicator for perfect leveling
- User-friendly interface
- Angle locking
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Ensure Your Surfaces Are Perfectly Horizontal or Vertical with Bubble Level app. There are four modes that you can choose: Circle Level: Simultaneously measure the horizontal and vertical angles. Vertical Level: Ideal for ensuring walls and other vertical surfaces are perfectly vertical. Horizontal Level: Perfect for checking that tables, floors, and other horizontal surfaces are perfectly horizontal. Mix Mode: All-in-one display featuring circle, vertical, and horizontal levels. Lock the Angle: Need to maintain a specific measurement? Use our "Lock the Angle" feature to freeze the current angle. Calibrate for Accuracy: Does your phone case or camera bump interfere with the leveling? Our calibration feature allows you to zero out the readings, ensuring you start from a perfectly horizontal or vertical point. Audible Indicator: Activate the sound function to receive an audio cue when your surface is perfectly horizontal or vertical. Accuracy has never sounded so good! Why Choose our app? User-friendly interface Highly accurate measurements Versatile features for a wide range of applications Handy add-ons like angle locking and calibration Bubble Level app is free. You can use it forever, at no cost. However, Bubble Level does offer premium features for its subscribers. If you decide to purchase an upgrade, you will unlock additional features. ADDITIONAL FEATURES FOR SUBSCRIBED USERS • No Ads • Access the "lock" feature • Access the vertical level, horizontal level, and mix mode. Terms of Use: https://kociapp.github.io/Bubble-Level/term-of-use Privacy Policy: https://kociapp.github.io/Bubble-Level/privacy-policy
PDF Viewer
Easily convert various file formats to PDF and back again. This app supports conversions from images, documents, and presentations, allowing you to manage and share your files efficiently. It also offers OCR capabilities to convert photos into editable text.
- Convert JPG, Word, Excel, PPT to PDF
- Convert PDF to other formats
- Share and save converted files
- Access conversion history
- Pull files from iCloud or gallery
- Convert Photos to Text (OCR)
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PDF Viewer makes file conversions easy, fast, and completely free. Convert files like JPG, Word, Excel, PPT, and more to PDF or convert PDFs back to other formats all from your iPhone. Here’s what you can do with PDF Viewer: ● Convert files from popular formats like JPG, DOC, XLS, PPT, TXT, RTF, EPUB, and many more to PDF ● Convert PDF files back into various formats ● Share or save your converted files directly to iCloud or other apps ● Access and manage your conversion history ● Pull files from iCloud, your photo gallery, or capture a new image for conversion ● Share converted files via iMessage, open them in other apps, print, or save them to your Files app ● Convert Photos to Text ———————————————————— ◆ How to convert files with PDF Viewer ◆ 1. Select the file you want to convert 2. Choose your desired output format (PDF or another) 3. Tap the “Convert” button 4. Your file will be instantly converted (you can then save it, share it, or access it from your history) ———————————————————— PDF Viewer subscription policy: Once you sign up to PDF Viewer Premium, you will have full access to all of PDF Viewer’s features for free for 3 days. You can cancel your subscription any time and you will be sent a reminder before your PDF Viewer subscription begins after your trial. PDF Viewer Premium Subscription: - With a PDF Viewer Premium subscription you have access to all of PDF Viewer’s advanced PDF editing features, and access to all future updates. - PDF Viewer Premium monthly subscription is billed monthly for $4.99, and payment will be charged to iTunes Account after a 3 day free trial. - Subscription automatically renews unless auto-renew is turned off at least 24-hours before the end of the current period. - Account will be charged for renewal within 24-hours prior to the end of the current period, and identify the cost of the renewal. - Subscriptions can be managed by the user and auto-renewal can be turned off by going to the user's iPhone Settings -> Apple ID -> Subscriptions. ———————————————————— Connect with us on X and Instagram: @AndrewLeeReal Have any questions or recommendations? Feel free to reach out to me at: Andrew@AndrewLee.Ventures Privacy Policy: http://andrewlee.ventures/privacy Terms of Use: http://andrewlee.ventures/terms
Screenshots
Verdict
The clearest difference is ads: PDF Viewer at none against Bubble Level's shown. PDF Viewer also leads on review sentiment (89% vs 75%) and ratings volume (243 vs 60). Bubble Level's advantage is update cadence (every 2 weeks vs every 3 months). On price, rating, in-app purchases and monetization model there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. Bubble Level sells 3 in-app purchases, starting at $1.99 per 7 days and PDF Viewer sells 2 in-app purchases, starting at $4.99 per month. Whichever you choose, the download price is not the number that matters.
On the App Store both sit at effectively the same score — 4.8 for Bubble Level against 4.8 for PDF Viewer. Both are backed by a comparable volume of ratings — 60 and 243 respectively. Written reviews are what separate them: 75% of Bubble Level's written reviews are positive against 89% of PDF Viewer's.
Bubble Level ships an update every 2 weeks, PDF Viewer every 3 months. The most recent releases landed on October 14, 2026 and October 21, 2026 respectively.
| Parameter | Bubble Level | PDF Viewer |
|---|---|---|
| Price | Free | Free |
| Rating | 4.8 (60 ratings) | 4.8 (243 ratings) — better |
| Positive reviews | 75.0% of reviews | 89.5% of reviews — better |
| Number of ratings | 60 | 243 — better |
| Update frequency | Every 2 weeks — better | Every 3 months |
| Ads | Yes | No — better |
| In-app purchases | Yes | Yes |
| Monetization | Free with in-app purchases | Freemium |
| Devices | iPhone, iPad, iPod — better | iPhone, iPod |
| Requires iOS | 15.0 | 15.0 |
| Further details — not scored | ||
| Size | 16 MB | 11 MB |
| Age rating | 4+ | 4+ |
| Developer | Andy Sutanto | Andrew Lee |
Customer experience
Bubble Level
PDF Viewer
Bugs and requests
Bubble Level
Not enough reviews yet to summarise bugs or requests.
PDF Viewer
Reported bugs
4 issues- App doesn't function on iPad mini (current model)
- Forced review requirement blocks app access
- Document quality issues when converting images to PDF
- Occasional glitches during operation
Requested features
5 requests- Add file deletion functionality
- Implement in-app camera scanning feature
- Add page merge and delete options
- Include file size/quality customization
- Support for more device types (iPad compatibility)
In-app purchases
Bubble Level
- Bubble Level Pro$1.997 Days
- Spirit Level Pro$19.991 Year
- Waterpas Pro - Waterpass$39.99
PDF Viewer
- PDF Converter: Premium3 Days trial$4.991 Month
- PDF Converter: PremiumFree
Questions
Is Bubble Level free?
Is PDF Viewer free?
Which has better reviews, Bubble Level or PDF Viewer?
Do Bubble Level or PDF Viewer have ads?
Which is updated more often, Bubble Level or PDF Viewer?
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